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Finding the Third Proportional to 391.94 and 628.38

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Solution

The third proportional to 391.94 and 628.38 is: 1,007.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    391.94 : 628.38 = 628.38 : x
  2. Step 2: Convert to fraction form
    391.94/628.38 = 628.38/x
  3. Step 3: Cross multiply
    391.94x = 628.38 × 628.38
  4. Step 4: Simplify right side
    391.94x = 394,855.14
  5. Step 5: Solve for x
    x = 394,855.14/391.94
  6. Step 6: Final answer
    x = 1,007.44

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Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.